Let's evaluate each statement to determine its correctness.
(i) Bases would be soapy when touched.
This is a characteristic physical property of alkaline solutions (bases dissolved in water). They feel slippery or soapy to the touch. This statement is correct.
(ii) Malic acid is present in apples.
This is a well-known fact. Malic acid is the primary organic acid found in apples and contributes to their tart flavor. This statement is correct.
(iii) Stearic acid is present in fats.
Stearic acid is a common saturated fatty acid found in many animal and vegetable fats and oils. This statement is correct.
(iv) Tooth paste is acidic in nature.
This is incorrect. Bacteria in the mouth produce acids that can damage tooth enamel. Toothpaste is formulated to be basic (alkaline) to neutralize these acids and help protect the teeth.
Since statements (i), (ii), and (iii) are correct and statement (iv) is incorrect, the correct option includes only (i), (ii), and (iii).